Spectrum Synthesis Based on Non-linear Addition

✍ Scribed by El Bakush, T. A.; El Gomati, M. M.

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 730 KB
• Volume: 24
• Category: Article
• ISSN: 0142-2421
• DOI: 10.1002/(sici)1096-9918(199603)24:3<163::aid-sia97>3.0.co;2-c

✦ Synopsis

One of the proposed approaches in the literature for quantitative analysis in AES is the linear addition of elemental spectra acquired in the direct energy mode (N(E) vs. E and E -N(E) vs. E). Quantification is then achieved by matching the shape of the added spectra to that of an unknown that was also collected under identical experimental conditions. However, it is shown here that the linear combination of elemental spectra employed in this approach has no real justification in theory. Any agreement with experiment found using this approach can therefore be of doubtful value. To avoid uncertainty, non-linear addition formulae that take the matrix effects (of the substrate) into consideration are developed. Results obtained with these formulae on AuCu alloys are described. The observed success of the linear addition is explained in terms of more rigorous non-linear addition.